Furnace.



c. H. LISTER.

FURNACE.

APPLICATION FILED Dic. 3. 1915.

cimrzes'fen yllr @9% a@ C. H.`LISTER.

FURNACE.

APPLl-GATIQN FILED DEC. 3. 1.915.

. .J m. m 12 e H Tv m W* AUT Fm ey ,w8 vr .E2 zz n, 7@ w I. Dom h J i ce! .LJ .a s a 5 s 1 wf Nrran STATES PATENT lorrioii. i i x CHARLES` HENRY LISTER, or Nonrrrsrr. PAUL, MINNESOTA, AssIGNoR To MINNESOTA.

MANUrac'runnns1l ASSOCIATION,V or NORTH sfr. rAUL, MINNESOTA, aconronn- TION F MINNESOTA.

rUnNAon.

To all whom z'zfv may concern:

Be it known that I, CHARLES HENRY LIS- Tnn, a citizen :of the United States, residing at North St.j Paul, in the county'of Ramsey and State of Minnesota, have invented new and useful Improvements in Furnaces, of which the following is a specification.

My invention relates to improvements in furnaces. Its Objectis -to provide a simple, durable and inexpensive furnace which may be conveniently shipped from the factory in lmookdown form and easily assembled by inexperienced hands at its destination. lMy invention also includes certain novel details -of construction'which will be here-V inafter particularly described and pointed out in the claims. f

In the drawings" Figure 1 is a vertical central sectional view of my improved furnace; Fig. l2 is a detail vertical sectional view! taken-through the ldoor frame of the furnace; Fig. 3 isa transverse sectional View taken onthe line 3-3of Fig. 1; Fig. 4 is a detaill plan view-of the cover of the inner drum; Fig. 5 is a plan view of the door frame'anddoors; Fig.' 6 isa perspective view in detail illustratingfthe connection betweenv the cover of a drumand theside wall thereof; Fig. 7 is a-perspective view in detail illustrating the connection between the 'base members of the drums and the lside walls thereof; Fig. Y8 Iis a detail perspective view of one of the resilient ribs employed in the constructi-on of the side walls of the furnace drums; and Fig. 9 is a plan view in detail" showing members.

Referring to the drawings, I have used the reference letter A to indicate the inner or heating drum of the furnace and B the outer or hot air drum. The inner drum A is supplied with a fire box C. The outer drum B receives fresh air through the opening 10, incloses it about said inner drum A, where it is heated, and finally conducts said heated air to the distributing conduits, common to hot air furnaces. Said drums each comprise a plurality of cast iron base members 11, adapted to rest upon asuitable foundation 1.2, sheet metal side walls 13 andl cast iron covers 14 therefor. The walls 13 of said inner and outer drums A and B include a door frame 15, said frame being provided with openings 16 therein, leading to the inner drum A and furnished with doors 17 for said openportions of two adjoining base l' speeiacatioof Lttersratent. Patented Feb, 25 1919 'Application fueu December 3,--19155 serial No. 64,875. k-

vdrums consist of curved sheet metal panels inserted at their lower edges in the grooves 19 of said bases. Vertical ribs 21 are provided to join the adjacent panels, each rib consisting ofa sheetmetal strip having a normally open tubular bead 22 extending longitudinally through the middle thereof. The margins of said strip form Hanges 23 which are turned back from the seam in said tubular bead. Channels 24 between the beads 22 and lianges 23 receive the adjacent edges o-f the panels 13 and said ribs reinforce said sheet metal panels, allow for the contraction and expansion thereof and provide tightly rtting, neat appearing joints between the1n.5 The beads 22 at/the lower endsof the ribs 21 receive the abutting half rounded lugs 2()v of adjacent base members 11 and unite said members. Thecovers 14 of said drums are formed with depending flanges 25 and moldings 26 (Fig. 6) `similar. to `the moldings 18 on the base members, said anges and moldings being arranged to provide grooves 27 in the covers to receive the upper edges of the sheet metal panels. Depending roundedlugs 28 are also formed on said covers to t into the open ends of the beads 22 at the upper ends of the ribs and together with the anges 25 and moldings 26 form rigid connections between the side walls and covers. The panels 13 in the outer drum B adjacent to the door frame 15 `overlap the edges of said frame as shown (Figs. v6 and 7)V of a skeleton iframe lined on its inner side with a sheet metal plate 29 secured bybolts 3()` or other suitable means to saidframe.V An opening 31in said coveris ittedwit'lr'ay smoke pipe 32 coiled within the upper part Y of the outer drum B and passing through The `advantages of my device reside insimplieity and cheapness of' constructiomi convenience in shipping,-V veaseviny assembling:- thefpartsxand adaptability of .the 4wallsl to contract and expand :and :thereby avoid 'the warping,andV distortionrof the drums.

Havinggdescribedy my invention', what 1 I elaiinuas new-` andy desi-rey to protect by Let# ters Patent,A is:

l.- Inaa u'nnacefawseriesof abutting base members',f.each niemberlbeing 'grooved fat 'its upper :side and formed with an' upright half rounded :lug: atn each endthe flat sidesof said' lugsf-registermgawith the sides of ad,- jaeenttlugsjaon: abutting, base members, a eoversgrooved: at its lower side and provided with dependingrounded lugs, sheet*i metal panels ,seatedf at their Aends inthe grooves iny saidabasefmembers and cover,y and .-ribs j oin-l ingtthef4 sides-:of ysaid :panels, each rib oompri'sing a.;,stripf,of metal formed with. a tubuz-s lariibeadf extending; longitudinally through the n1iddle thereof-,t said 'ribs-being Iadapted tosnugly receive -thef edges :of thel panelsin the channels between the sidesof the beads and margins of said strips and also adapted to kreceive in` the vopen'endsy 'ofithe beads," at

` the bottom oftherbsy'the abutting-lugs on thebase membersandiinthe endsof the beads, at the top of the ribs, the depending lugs on the cover.

2'.' In a. furnace, two drums, one arranged withinl the other-reach drum comprising a series of abutting Ibase sections, each section being grooved at, itsfupperside and formed with lanfupright. half rounded-v-rlugi,v at each end;v the iatsides'osaid lugs registering withtheatisideseo adjacent lugs onaabutting-base 1nembers,-,a.-coVer-- groovediat its lower sidefs. and-sl provided; with: depending;v

rounded zlgsf'sheet nietalipanels` seated at their :endsfing the grooves in said ibase meinbers and cover,4 and. ribs-tj oining` thensides ofsaidy panels, ,eachfribi comprising,aa-stripe' of metal for-med, with artubular bead; extending; longitudinally through y:ther middle.l of f said strip, the sealni infsaidbead being nori'nallk slightly open, .said i ribs; beingi adapted r to snugly` receive/:the edges` of the panels lin the channels between the-sides of the vbeads and margins of said strips', and also adapted.

to-receive-in the open endsoi the beads,-at

thefbase: members and: in theupper ends ofthe beads,` the depending'lugs .on Uthe recover, a-'door frame'. commento both: dru'ms,-tted frame,A a grate Iwithinthe-inner drum supf; ported findependentlythereof` 'anda re walllv carried byisaid .gra-te; y

VVhereo LI Vhave hereunto 7subscribed-my:

name fto: this Aspeoication.A

(imanes-HENRY rai-strian.KL

Copies Pof :thisspagtentimaybei obtained /fo'r `ve tents each, byaddressing ,'the; Commissioner Vo1` Patents,

Y Washingtomncza 

